JP2017015339A - Control device of heat source machine for air handling unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of a heat source machine for air handling unit capable of securing comfort in an air conditioning space by compensating capacity control in the case where capacity control according to a command is not actually performed in the heat source machine.SOLUTION: A control device of a heat source machine for air handling unit includes: a blower for taking in the outside air; and a heat exchanger for exchanging heat between the outside air taken in by the blower and a refrigerant delivered from the heat source machine. It also includes means for notifying different operation content to a controller of the air handling unit, with respect to operation content of the heat source machine instructed from the controller of the air handling unit for supplying the air which has passed through the heat exchanger as air for air conditioning to the air conditioning space, in the case where the operation which is different from the operation content is executed by the heat source machine.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a control device for a heat source unit for an air handling unit that introduces outside air, passes the heat through a heat exchanger, and supplies the air that has passed through the heat exchanger to an air-conditioned space.

  A heat exchanger connected to the refrigerant pipe to the heat source unit (outdoor unit) is housed in a case together with the blower, and outside air is introduced into the case through the operation of the blower and passed through the heat exchanger, and the air passed through the heat exchanger is used for air conditioning. A direct expansion type air handling unit that supplies air to an air-conditioned space is known.

  As an example of controlling the operation of the heat source device from this air handling unit, a direct digital controller (Direct Digital controller) so-called DDC capable of setting control conditions is provided, and the temperature of the air-conditioning air is set to the set temperature. There are those that control the operation and capacity of the air handling unit and the heat source unit. In this case, the DDC functions as a controller for the air handling unit.

  The DDC can appropriately rewrite and rewrite the control condition by the operation of the worker who installs the air handling unit. By writing an appropriate control operation in the DDC, it is possible to adapt the air handling unit operation control and the heat source machine operation control to the environment of the installation site. On the other hand, the heat source machine operates according to the instruction from the DDC.

JP 2005-257166 A

  The DDC simply commands the necessary capacity to the heat source machine. The capacity control according to the command of the DDC may be actually performed by the heat source unit, but otherwise the temperature of the air-conditioning air cannot be maintained at the set temperature, and the comfort of the air-conditioned space is impaired.

  The heat source device may prioritize protection control of equipment in the heat source device over the operation instruction of the DDC. In addition, the defrosting operation for removing frost attached to the outdoor heat exchanger in the heat source device is preferentially performed ignoring the operation instruction of the DDC.

  An object of an embodiment of the present invention is to provide a heat source for an air handling unit that can ensure the comfort of an air-conditioned space by supplementing the capacity control when the capacity control according to the command as described above is not actually performed by the heat source machine. It is to provide a control device for the machine.

  The control device for a heat source unit for an air handling unit according to claim 1 includes a blower that takes in outside air, and a heat exchanger that exchanges heat between the outside air taken in by the blower and a refrigerant sent from the heat source unit. The heat source unit performs an operation different from the operation content instruction for the operation content of the heat source unit instructed from the controller of the air handling unit that supplies the air that has passed through the exchanger to the air-conditioned space as air-conditioned air. In this case, there is provided means for notifying the controller of the air handling unit of different operation contents.

The block diagram which shows the structure of one Embodiment. The figure which shows the format of the alerting | reporting signal in one Embodiment. The figure which shows the modification of the format of the alerting signal of FIG. The figure which shows another modification of the format of the alerting signal of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The main body 1 of the air handling unit shown in FIG. 1 has a ventilation path (first ventilation path) 2 and a ventilation path (second ventilation path) 3 that communicate between the air-conditioned space and the outdoor space inside in an adjacent state. For example, it is arranged through the wall of the building.

  The ventilation path 2 has a return air port 2a that faces the indoor air-conditioned space and an exhaust port 2b that faces the outdoor space. The air in the air-conditioned space that flows into the return air port 2a is led to the exhaust port 2b and discharged to the outside. To do. The ventilation path 3 has an outside air introduction port 3a facing the outdoor space and an air supply port 3b facing the indoor air-conditioned space. The outside air flowing into the outside air introduction port 3a is guided to the air supply port 3b and supplied to the air-conditioned space. To do.

  An air filter 11 for removing dust, a blower 12 for ventilation, and a total heat exchanger 13 are sequentially arranged from the return air port 2a to the exhaust port 2b of the ventilation path 2. By the operation of the blower 12, the air in the air-conditioned space flows into the return air port 2a, and the air that has flowed in passes through the air filter 11, the blower 12, and the total heat exchanger 13 and is discharged to the outside from the exhaust port 2b.

  A total heat exchanger 14, air heat exchangers 21 and 31, an air supply blower 15, and a dust removing air filter 16 are sequentially arranged from the outside air introduction port 3 a to the air supply port 3 b of the ventilation path 3. By operating the blower 15, outside air is taken into the outside air introduction port 3 a, and the taken-in air passes through the total heat exchanger 14, the air heat exchangers 21 and 31, the blower 15, and the air filter 16, and the air supply port 3 b. Supplied to the air-conditioned space.

  In the ventilation path 2, the return air temperature sensor 41 is arrange | positioned in the vicinity of the return air port 2a, and the exhaust temperature sensor 42 is arrange | positioned in the vicinity of the exhaust port 2b. In the ventilation path 3, a total hot air temperature sensor 43 is disposed between the total heat exchanger 14 and the air heat exchangers 21 and 31, and a supply air temperature sensor 44 is disposed in the vicinity of the air supply port 3b.

  The total heat exchangers 13 and 14 are interconnected via a water pipe, and heat exchange between the air flowing into the total heat exchanger 13 and the outside air flowing into the total heat exchanger 14 is performed through water in the water pipe. To do. That is, the heat of the air passing through the ventilation path 2 is given to (transfers to) the outside air flowing into the ventilation path 3.

  The air heat exchangers 21 and 31 are arranged side by side in a direction orthogonal to the ventilation direction of the ventilation path 3, and are connected to the heat source units 20 and 30 outside the main body 1 by refrigerant piping.

  The heat source unit 20 includes a compressor, a four-way valve, an outdoor heat exchanger, and an expansion valve that constitute a heat pump refrigeration cycle together with the air heat exchanger 21. During cooling, the refrigerant discharged from the compressor is transferred from the four-way valve to the outdoor heat exchanger. The refrigerant flowing out of the outdoor heat exchanger is returned to the compressor through the expansion valve, the air heat exchanger 21 and the four-way valve, and the refrigerant discharged from the compressor is sent from the four-way valve to the air heat exchanger 21 during heating. The refrigerant flowing out of the heat exchanger 21 is returned to the compressor through an expansion valve, an outdoor heat exchanger, and a four-way valve. The heat source unit 30 includes the same refrigeration cycle components as the heat source unit 20 and is connected to the air heat exchanger 31.

  The return air temperature sensor 41, the exhaust temperature sensor 42, the total hot air temperature sensor 43, and the supply air temperature sensor 44 are connected to a signal line to a direct digital controller so-called DDC 40 which is a controller of the air handling unit. Is done. The DDC 40 supplies the capacity control signals A1 and A2 corresponding to the detected temperatures (supply / exhaust temperature status) of the return air temperature sensor 41, the exhaust temperature sensor 42, the total hot air temperature sensor 43, and the supply air temperature sensor 44 to the heat source units 20 and 30. To be issued against.

Specifically, the DDC 40 has the following means (1) and (2) as main functions.
(1) The return air temperature sensor 41, the exhaust temperature sensor 42, the total hot air temperature sensor 43, and the supply air temperature sensor 44 so that the temperature of the air-conditioning air supplied to the air-conditioned space becomes a predetermined set temperature. The first control means for controlling the air volume of the blowers 12 and 15 and the capacity of the heat source devices 20 and 30 according to the detected temperature. The first control means relates to the capability control of the heat source units 20 and 30, and the capability control signal A1 for setting the operation frequencies F1 and F2 of the compressors in the heat source units 20 and 30 to the target operation frequencies F1t and F2t. , A2 is emitted to the heat source units 20 and 30 via the controllers (control units for the air handling unit heat source unit) 50 and 60 described later. The target operating frequencies F1t and F2t include zero Hz when the operation of each compressor is stopped.

  The target operating frequencies F1t and F2t are set so that the detected temperature of the supply air temperature sensor 44 becomes a set value.

  (2) Second control means for correcting the control content of the air handling unit according to the notification signal sent from the controllers 50 and 60.

  After installation, the DDC 40 can be operated by an on-site worker to appropriately set or change the control conditions (control program) for the heat source units 20 and 30 according to the environment of the installation location. Here, various modifications of the control content based on the notification signal can be considered by changing the setting of the control program. Hereinafter, the capability control (capacity control signal for the heat source units 20 and 30 according to the notification signal will be described. A control for correcting A1, A2) will be described as an example.

  In general, an analog signal is adopted as an output signal of the DDC 40 in order to provide versatility, and the capability control signal A1 is an analog signal whose voltage level is variable in the range of 0 to 10 V, and the target is determined by the change in the voltage level. Specify the operation frequency F1t. The capability control signal A2 is an analog signal that is variable in a voltage level range of 0 to 10 V, and designates a target operating frequency F2t by a change in the voltage level.

  For this reason, in order for the heat source units 20 and 30 to directly receive the signal of the DDC 40, it is necessary to receive an analog signal and confirm the instruction content of the analog signal.

  However, since the heat source units (outdoor units) 20 and 30 for a general air conditioner are connected to a dedicated indoor unit, digital signals are exchanged by bus communication or serial communication between them. It does not have a function to receive and process analog signals. For this reason, it is necessary to develop heat source units 20 and 30 dedicated to the air handling unit. In order to eliminate such trouble and to standardize the heat source units 20 and 30, the controllers 50 and 60 that convert signals so that the heat source units 20 and 30 for the air conditioner can receive instructions from the DDC 40 are connected to the DDC 40 and the heat source. It is inserted between the communication lines with the machines 20 and 30.

  The conventional controllers 50 and 60 change the instruction to the heat source units 20 and 30 composed of analog signals from the DDC 40 into a digital signal communication form that can be received by the heat source units 20 and 30, and then unilaterally the heat source units 20 and 30. Just sent to.

  On the other hand, the controller 50, which is the control device for the air handling unit heat source unit of the present embodiment, has an analog signal line for receiving the capacity control signal A1 and a digital signal line for sending a notification signal B1 described later to the DDC 40. And is connected to the heat source controller 20a of the heat source unit 20 via the control data bus C1. Similarly, the controller 60 is connected to the DDC 40 via an analog signal line for receiving the capability control signal A2 and a digital signal line for sending a later-described notification signal B2 to the higher-level DDC 40, and the control data bus C2 is connected to the controller 60. To the heat source controller 30a of the heat source device 30. The controllers 50 and 60 are connected to monitors 51 and 61 for displaying operation states, respectively.

The controller 50 includes the following means (11) to (15) as main functions. Since the controller 60 is the same as the controller 50, description thereof will be omitted hereinafter.
(11) First control means for notifying the heat source controller 20a via the control data bus C1 of the capability (target operating frequency F1s) corresponding to the capability control signal A1 by, for example, a digital data signal representing the resolution in 16 steps.

  (12) A detecting means for sequentially detecting the capability (compressor operating frequency F1) of the heat source device 20 by inquiring of the heat source controller 20a.

  (13) A determination unit that determines whether the capability (operation frequency F1) detected by the detection unit has reached the capability (target operation frequency F1t) informed by the digital data signal.

  (14) Second control means for informing the DDC 40 of the determination result of the determination means by means of a notification signal B1 having a pattern of logic “1” and logic “0” as shown in FIG. .

  (15) Third control means for notifying the determination result of the determination means using, for example, character display or image display on the monitor 51.

  The logic “1” of the notification signal B1 indicates that the operating frequency F1 of the compressor in the heat source unit 20 has reached the target operating frequency F1t corresponding to the capacity control signal A1 (F1 ≧ F1t). The logic “0” of the notification signal B1 indicates that the operation frequency F1 has not reached the target operation frequency F1t (F1 <F1t).

  When the operating frequency is changed transiently, that is, there is a change in the operating frequency indication value from the DDC 40, and the period during which the heat source unit 20 supports the change, it is always the capability control signal. Although the indicated value of A1 and the target operating frequency F1t do not match, the above determination is not made for such a transient mismatch.

Next, the operation will be described.
The DDC 40 controls the air volume of the blowers 12 and 15 so that the temperature of the air-conditioning air supplied from the ventilation path 3 to the air-conditioned space becomes the set temperature, and the capacity control signal A1 to the heat source machines 20 and 30. Issue A2. For example, when the difference between the temperature of the air-conditioning air and the set temperature is large, the DDC 40 causes the capacity control signals A1 and A2 for increasing the target operating frequencies F1 and F2 or the heat source units 20 and 30 to operate from two. The capability control signals A1 and A2 for shifting to operation are issued. When the temperature of the air-conditioning air exceeds the set temperature and overshoots, the DDC 40 operates the capacity control signals A1 and A2 for reducing the target operating frequencies F1 and F2 or the heat source units 20 and 30 from one to one. The capability control signals A1 and A2 for shifting to operation are issued.

  The controllers 50 and 60 receive the capability control signals A1 and A2 issued from the DDC 40, and send the target operating frequencies F1s and F2s corresponding to the capability control signals A1 and A2 to the heat source controllers 20a and 30a of the heat source units 20 and 30, respectively. Command. The heat source controllers 20a and 30a set the operation frequencies F1 and F2 of the compressors in the heat source devices 20 and 30 to the target operation frequencies F1s and F2s according to commands from the controllers 50 and 60, respectively.

  The controllers 50 and 60 inquire the actual operation frequencies F1 and F2 of the compressors in the heat source units 20 and 30 to the heat source controllers 20a and 30a and sequentially detect them, and the detected operation frequencies F1 and F2 are the target operation frequencies. It is determined whether F1t and F2t have been reached. In order to perform this comparison determination, the controllers 50 and 60 each have a memory and store target operation frequencies F1s and F2s corresponding to the capability control signals A1 and A2 issued from the latest DDC 40.

  Then, the controllers 50 and 60 notify the DDC 40 of the determination result by using the notification signals B1 and B2 for correcting the capability control signals A1 and A2, and use the monitor 51 and 61, for example, character display or image display for the determination result. To inform.

  The DDC 40 that has received the notification signals B1 and B2 recognizes whether or not the operation frequencies F1 and F2 have reached the target operation frequencies F1t and F2t based on the notification signals B1 and B2.

  For example, although the operating frequencies F1 and F2 have reached the target operating frequencies F1t and F2t, the temperature of the air-conditioning air may not readily reach the set temperature. The DDC 40 determines this from the fact that the state in which the notification signals B1 and B2 are logic “1” signals continues for a predetermined time. As a result of this determination, the DDC 40 corrects the target operating frequencies F1t and F2t in the upward direction based on the determination that the current target operating frequencies F1t and F2t are insufficient in air conditioning capacity, and the corrected target operating frequency F1t. , F2t are issued for capability control signals A1 and A2.

  As described above, the controllers 50 and 60 determine whether the operation frequencies F1 and F2 of the compressors in the heat source devices 20 and 30 have reached the target operation frequencies F1t and F2t according to the capacity control signals A1 and A2 from the DDC 40. Since the controller 50, 60 notifies the DDC 40 of the determination result for correction of the capacity control for the heat source apparatus 20, 30, the capacity control according to the capacity control signals A1, A2 from the DDC 40 is performed. If it is not actually performed at 30, it is possible to secure the comfort of the air-conditioned space by supplementing its capacity control.

  Since the determination results of the controllers 50 and 60 are notified by the character display and image display of the monitors 51 and 52, the maintenance worker can easily know the state of the heat source devices 20 and 30.

[Modification]
In the above embodiment, the DDC 40 is informed of the determination result as to whether or not the operating frequencies F1 and F2 have reached the target operating frequencies F1t and F2t by the notification signals B1 and B2 having patterns of logic “1” and logic “0”. However, as shown in FIG. 3, in addition to the logic “1” and logic “0” patterns, notification signals B1 and B2 having a pattern in which logic “1” and logic “0” are repeated in a short time may be used. Logic “1” indicates that the operating frequencies F1 and F2 of the compressor in the heat source unit 20 are the same as the target operating frequencies F1t and F2t according to the capacity control signals A1 and A2 (F1 = F1t, F2 = F2t). ). Logic “0” represents that the operating frequencies F1 and F2 are less than the target operating frequencies F1t and F2t (F1 <F1t, F2 <F2t). A short repetition of logic “1” and logic “0” indicates that the operating frequencies F1 and F2 exceed the target operating frequencies F1t and F2t (F1> F1t, F2> F2t).

  In the said embodiment, it was set as the structure which notifies DDC40 only by notification signal B1, B2 only the determination result whether the operating frequency F1, F2 of each compressor in the heat source machine 20, 30 has reached the target operating frequency F1t, F2t. However, in addition, it is good also as a structure which notifies DDC40 by notification signal B1, B2 of execution of the high pressure release control in the heat-source equipment 20,30, low pressure release control, a defrost operation, etc.

  Specifically, when the heat source controllers 20a and 30a enter high-pressure release control, low-pressure release control, or defrosting operation, the controller 50 or 60 is notified. The controllers 50 and 60 notify the DDC 40 of these control states received from the heat source controllers 20a and 30a by notification signals B1 and B2.

  The high pressure release means control for forcibly reducing the operating frequencies F1 and F2 (the number of revolutions) of the compressor so that the high pressure portion of the refrigeration cycle of the heat source devices 20 and 30 does not exceed the allowable pressure set value. The low pressure release control is a control for forcibly increasing the operating frequencies F1 and F2 (rotations) of the compressor so that the low pressure portion of the refrigeration cycle of the heat source devices 20 and 30 does not fall below the allowable pressure setting value. Etc. In addition, during the defrosting operation of the heat source units 20 and 30, the defrosting operation is executed at a predetermined defrosting operation frequency of the fixed compressor. In any of these high pressure release control, low pressure release control, and defrosting operation, the operation frequencies F1 and F2 do not coincide with the target operation frequencies F1t and F2t corresponding to the capacity control signals A1 and A2.

  In this case, as shown in FIG. 4, patterns having logic “1” and logic “0” in one cycle and different so-called on and off duties, which are ratios of the logic “1” period in the cycle, are notified. It may be added to the signals B1 and B2. On / off duty D1 (for example, 10%) indicates that high-pressure release control is being executed. On / off duty D2 (for example, 40%) indicates that the low pressure release control is being executed. The on / off duty D3 (for example, 70%) indicates that the defrosting operation is being performed.

  The DDC 40 that has received such a notification signal is affected by the fact that the heat source units 20 and 30 are operated at an operation frequency different from the target operation frequencies F1t and F2t according to the capability control signals A1 and A2 instructed by the DDC 40. It is possible to incorporate a control operation for mitigating the above.

  The DDC 40 receives these control states from the controllers 50 and 60 by the notification signals B1 and B2, and supplies them to the main body 1 of the air handling unit if, for example, the heat source unit 20.30 is executing high-pressure release control. Since the amount of heat that is generated decreases, the air volume of the fan 15 can be increased to compensate for this. On the other hand, if priority is given to keeping the blowing temperature constant rather than the supply heat quantity, the air volume of the fan 15 is reduced. Further, during the defrosting operation, since the cold air is blown out during the heating operation, the DDC 40 may stop the fan 15.

  In the present embodiment, two independent heat source units 20 and 30 are used. Since the probability of two heat source units 20.30 entering the defrosting operation at a time is considerably low, the target operation frequency F1t, F2t of the other heat source unit is set higher than usual during the defrosting operation of one heat source unit. The capability control signals A1 and A2 may be transmitted. Thereby, when the capacity | capacitance of the two heat source machines 20 and 30 is added together, the fall of heating capacity can be suppressed.

  Further, a notification signal indicating that the heat source units 20 and 30 are 5 minutes before the start of the defrosting operation may be supplied from the controllers 50 and 60 to the DDC 40. As this signal, ON / OFF duty D4 (for example, 100%) can be used. When the DDC 40 receives a notification signal indicating 5 minutes before the start of the defrosting operation, the DDC 40 increases the heating capability in advance and reduces the indoor temperature drop in the defrosting operation that occurs thereafter. Capability control signals A1 and A2 with F1t and F2t higher than normal may be transmitted to the controllers 50 and 60.

  As described above, according to the present embodiment, when the heat source unit performs an operation different from the instruction content with respect to the operation content of the heat source unit instructed from the DDC which is the controller of the air handling unit, the controller The different operation contents can be notified to the DDC. As a result, it becomes possible for the operator who installs the air handling unit to incorporate in the DDC a control operation that alleviates a problem that occurs in the air handling unit when an operation different from the instruction is executed on the heat source unit side.

  In addition, the said embodiment and modification are shown as an example and are not intending limiting the range of invention. The novel embodiments and modifications can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the spirit of the invention. In these embodiments and modifications, the scope of the invention is included in the gist, and is included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Ventilation path (1st ventilation path), 3 ... Ventilation path (2nd ventilation path), 11 ... Air filter, 12 ... Blower, 13, 14 ... Total heat exchanger, 15 ... Blower, 16 ... Air filter, 20, 30 ... heat source machine, 20a, 30a ... heat source controller, 21, 31 ... heat exchanger, 40 ... DDC (controller of air handling unit), 50, 60 ... controller (heat source machine for air handling unit) , 51, 61 ... monitor, A1, A2 ... capability control signal, B1, B2 ... notification signal

Claims (4)

  A blower that takes in outside air, and a heat exchanger that exchanges heat between the outside air taken in by the blower and the refrigerant sent from the heat source unit, and supplies the air that has passed through the heat exchanger to the air-conditioned space as air-conditioning air When the heat source unit performs an operation different from the operation content instruction for the operation content of the heat source unit instructed from the controller of the air handling unit, the controller of the air handling unit A control device for a heat source unit for an air handling unit, characterized by comprising means for informing the device. 2. The control device for a heat source unit for an air handling unit according to claim 1, wherein the operation different from the instruction of the operation content is being operated with a different capability with respect to the capability instruction of the heat source unit.   2. The control device for a heat source unit for an air handling unit according to claim 1, wherein the operation different from the instruction of the operation content is protection control that is independently performed by the heat source unit.   The control device for a heat source unit for an air handling unit according to claim 1, wherein the operation different from the instruction of the operation content is a defrosting operation of the heat source unit.

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